globalchange  > 气候变化与战略
DOI: 10.1029/2018GB005973
论文题名:
Diverse Mycorrhizal Associations Enhance Terrestrial C Storage in a Global Model
作者: Sulman B.N.; Shevliakova E.; Brzostek E.R.; Kivlin S.N.; Malyshev S.; Menge D.N.L.; Zhang X.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2019
卷: 33, 期:4
语种: 英语
英文关键词: biogeochemical cycle ; carbon emission ; carbon sequestration ; carbon sink ; global change ; mycorrhiza ; nitrogen ; nutrient availability ; soil nitrogen ; symbiosis ; terrestrial ecosystem ; Fungi
学科: carbon ; elevated CO2 ; global land model ; mycorrhizae ; nitrogen ; soil
中文摘要: Accurate projections of the terrestrial carbon (C) sink are critical to understanding the future global C cycle and setting CO2 emission reduction goals. Current earth system models (ESMs) and dynamic global vegetation models (DGVMs) with coupled carbon-nitrogen cycles project that future terrestrial C sequestration will be limited by nitrogen (N) availability, but the magnitude of N limitation remains a critical uncertainty. Plants use multiple symbiotic nutrient acquisition strategies to mitigate N limitation, but current DGVMs omit these mechanisms. Fully coupling N-acquiring plant-microbe symbioses to soil organic matter (SOM) cycling within a DGVM for the first time, we show that increases in N acquisition via SOM decomposition and atmospheric N2 fixation could support long-term enhancement of terrestrial C sequestration at global scales under elevated CO2. The model reproduced elevated CO2 responses from two experiments (Duke and Oak Ridge) representing contrasting N acquisition strategies. N release from enhanced SOM decomposition supported vegetation growth at Duke, while inorganic N depletion limited growth at Oak Ridge. Global simulations reproduced spatial patterns of N-acquiring symbioses from a novel niche-based map of mycorrhizal fungi. Under a 100-ppm increase in CO2 concentrations, shifts in N acquisition pathways facilitated 200 Pg C of terrestrial C sequestration over 100 years compared to 50 Pg C for a scenario with static N acquisition pathways. Our results suggest that N acquisition strategies are important determinants of terrestrial C sequestration potential under elevated CO2 and that nitrogen-enabled DGVMs that omit symbiotic N acquisition may underestimate future terrestrial C uptake. ©2019. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160133
Appears in Collections:气候变化与战略

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作者单位: Program in Atmospheric and Oceanic Sciences, Department of Geosciences, Princeton University, Princeton, NJ, United States; Sierra Nevada Research Institute, University of California, Merced, Merced, CA, United States; Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN, United States; NOAA Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States; Department of Biology, West Virginia University, Morgantown, WV, United States; Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN, United States; Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ, United States; Department of Ecology, Evolution, and Environmental Biology, Columbia University, New York, NY, United States; Woodrow Wilson School of Public and International Affairs, Princeton University, Princeton, NJ, United States; University of Maryland Center for Environmental Science, Frostburg, MD, United States

Recommended Citation:
Sulman B.N.,Shevliakova E.,Brzostek E.R.,et al. Diverse Mycorrhizal Associations Enhance Terrestrial C Storage in a Global Model[J]. Global Biogeochemical Cycles,2019-01-01,33(4)
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